jQuery如何访问插入DOM的html上的事件

Question

In my web app I have an unordered list of 15 items that appear on load. I am grabbing 100 new items from an API using ajax and adding them to the current ul by using .append(html) . Each li has a checkbox next to it that when selected needs to call some_function .

The elements that have been rendered are able to access some_function but not the newly loaded ones. How can I access some_function on the newly loaded ajax items? I've never dealt with this before and apparently since the items aren't "rendered" yet they can't access functions?

Answer 1

This is a great situation where you can use the jQuery on() function

You can read more about it here

Answer 2

Use event delegation -

$(document).on('change',".YourInputClass", some_function);

http://api.jquery.com/on/

Answer 3

You should use event delegation for such scenarios.. Basically you bind the handler to the parent element and filter out by a selector to trigger the handler.

Below is the pseudo code,

$('ul').on('click', '.checkbox', function () {
   some_function.call(this); //maintain the context if it is an external function.
});

Answer 4

You need to delegate the events.

If <div id="div1"></div> is a dynamically injected element and you want to attach the click event

$('staticContainer').on('click', '#div1', some_function);

Answer 5

Without seeing your code I am guessing that you have bound an event handler directly to the checkboxes

$('input[type="checkbox"]').click(function(event) {
    // Your code
});

To make this work with content added after the handler was created you would need to use a delegated handler that binds to a lower level, unchanged element and bubbles an event up to the checkboxes. I have used document though it would be advisable to bind it to a dom node further up, most likely the ul that the checkboxes are added to.

$(document).on('click', 'input[type="checkbox"]', function(event) {
    // Your code
});